submodule: bump openthread from `df20f3d` to `fd23fb1` (#382)
submodule: bump openthread from `df20f3d` to `fd23fb1` (#382)

Bumps [openthread](https://github.com/openthread/openthread) from `df20f3d` to `fd23fb1`.
- [Commits](https://github.com/openthread/openthread/compare/df20f3d91a12c1101331c29c42f2732a4dd06a56...fd23fb1add4e909b1d32f0df3ffe0e8c124a197a)

---
updated-dependencies:
- dependency-name: openthread
  dependency-type: direct:production
...

Signed-off-by: dependabot[bot] <5bdcd3c0d4d24ae3e71b3b452a024c6324c7e4bb@github.com>

Signed-off-by: dependabot[bot] <5bdcd3c0d4d24ae3e71b3b452a024c6324c7e4bb@github.com>
Co-authored-by: dependabot[bot] <1c358da00a777d4e9898c1280ab801e2df165188@users.noreply.github.com>
openthread/ot-nxp,openthread/ot-nxp,openthread/ot-nxp